package com.shine.level.easy;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * 两数之和
 * @author zhangshao
 * @date 2021/6/13 12:43 下午
 */
public class TwoSum {
//    public static int[]  twoSum(int[] nums, int target) {
//        for(int i=0;i<nums.length-1;i++){
//            for(int j=i+1;j<nums.length;j++){
//                if(nums[i]+nums[j] == target){
//                    return new int[]{i,j};
//                }
//            }
//        }
//        return null;
//    }

    public static int[] twoSum(int[] nums,int target){
        Map<Integer, Integer> map = new HashMap<>();
        for(int i=0;i<nums.length;i++){
            int temp = target - nums[i];
            if(map.containsKey(temp)){
                return new int[]{map.get(temp),i};
            }
            map.put(nums[i],i);
        }
        return null;
    }

    public static void main(String[] args) {
        int [] nums = {2,7,11,15};
        int target = 9;
        int[] result = twoSum(nums, target);
        System.out.println(Arrays.toString(result));

    }
}
